Controlled-Release Lawn Fertilizer 30-0-4 | Long-Term Green

30-0-4 Nitrogren fertilizer bag for lawns

The Lawn Medic | High-nitrogen fertilizer with controlled-release technology for extended feeding and consistent turf color.

★★★★★ 4.8 stars on over 5,000 orders

Controlled-Release Nitrogen Lawn Fertilizer 30-0-4 | Long Term Green

$29.00

Made for Canada Pro Grade Spreader Ready SGN 200-250 Regular Prill Slow Release Nitrogen Iron

"The fertilizer worked amazing. Lawn was super green all year. Will definitely be purchasing again." - Brent S.

Bag Size: 2kg

2kg
5kg
10kg

Product variants

Coverage (selected size)

Covers up to 1761 sq ft

In stock, ready to ship

Pickup available at Pickup Location UPS STORE

Usually ready in 24 hours

Iron Additive

Featuring Iron to help darken your lawn while providing it with required nutrients.

Keep your lawn consistently green—without the constant re-applying. This 30-0-4 controlled-release formula feeds steadily for long-lasting colour and density, while a touch of potassium supports tougher turf.

30-0-4

NPK

Reg - SGN 200-250

Prill Size

Granular

Application Type

Fast - 30% Slow Release

Nitrogen Release

Best For

Homeowners who want reliable, low-fuss feeding; maintaining colour and thickness through the main growing season.

What Makes It Different

This fertilizer uses controlled-release nitrogen technology to feed lawns gradually over time. Each granule is coated to release nutrients slowly as soil conditions trigger the release mechanism. This results in longer feeding, improved efficiency, and fewer growth surges compared to traditional quick-release fertilizers. The result is a consistently green lawn with less frequent applications.

Application Rate

1.1kg (2.5lbs) to 1.5kg (3.3lbs) per 1000sqft per application

Minimum Guaranteed Analysis

• Total Nitrogen (N) – 30%
• Soluble Potash (K₂O) – 4%
• Iron (Fe) – 1%

Product Details

NPK | 30-0-4
Nitrogen Release | Fast | 30% Slow Release Nitrogen
Prill Size | Regular Prill | SGN 200-250 | Standard prill size for all applications
Application Type | Granular | Apply with any lawn spreader

Storage & Handling & Safety

Storage

We recommend keeping your seed in a cool dry location, especially after opening. This helps to maintain a high germination rate for an extended period of time.

Handling

Seed is safe to handle. However if you are sensitive to airborne particles you may want to wear a mask when adding your seed to a spreader for instance.

Shipping & Returns

Shipping

We ship Canada wide. Most orders are shipped with UPS. Canada Post is used for some locations.

Shipping on Grass Seed is always free. Shipping on fertilizers is calculated based on weight.If your order combines seeds and fertilizers you will only be charged for the weight of the fertilizer. We do our best to offer a balance between fast shipping and reasonable shipping rates.

We strive to ship all orders within 24hrs (48hours max).

Please reach out to use if you have any questions.

Returns

All of our products can be returned within 30 days as long as it is unopened/unused.

If you have a concern with your product after opening it please reach out to use as we always work to find a solution and rectify any issues.

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Valid on individual fertilizers only. Grass seed is always free shipping.

Pairs well with

In stock! Ships within 1-2 business days.

Expedited shipping on all orders.

Only professional grade fertilizers.

30-Day Return Policy

Controlled-Release Nitrogen Lawn Fertilizer 30-0-4 | Long Term Green

2kg

$29.00

A Better lawn starts here

Don't Take Our Word For It

See what our happy customers are saying about how The Lawn Medic helped their lawns.

See All Our Reviews

Expedited Shipping on All Orders

Why This Fertilizer?

This premium nitrogen fertilizer uses controlled-release technology to provide a steady supply of nutrients over time. Instead of releasing all nutrients immediately, coated granules gradually feed the lawn as soil temperature and moisture activate the release mechanism. This results in more consistent growth, improved colour, and fewer surges in top growth compared to quick-release fertilizers. The added potassium helps support overall plant strength and stress tolerance. Controlled-release fertilizers are widely used in professional turf management because they improve efficiency while reducing the risk of nutrient loss.

Technical Details

Controlled-release nitrogen technologies were developed to improve nutrient efficiency in turfgrass systems. Unlike soluble nitrogen sources that release nutrients immediately after application, controlled-release fertilizers use coated granules that gradually release nitrogen in response to soil temperature and moisture conditions. Research from the University of Minnesota Turfgrass Science has demonstrated that controlled-release nitrogen can significantly improve nitrogen use efficiency while maintaining consistent turf colour.

Gradual nutrient release aligns nitrogen availability with plant growth demand, reducing excessive shoot growth and minimizing nutrient loss through leaching or volatilization. Studies summarized by the Penn State Center for Turfgrass Science show that controlled-release fertilizers can maintain turf colour for extended periods while reducing the frequency of fertilizer applications.

See the difference

Geoff D.

"I used seed and fertilizer from The Lawn Medic in the Spring. The transformation over about 5 weeks was incredible. The pictures tell the story. The new lawn came in thick and green and it has stayed that way all year. No weeds. Strong growth."

Testimonials

"Best result I've ever had in reseeding my lawn. No more big box branded lawn seed with pathetic results. Next fall will be the backyard's turn."
— Jose C.

"Lawn looks freaking awesome in December 😄😄 Will definitely be ordering again in the spring."
— Daryl F.

"Despite this summer’s heat and drought, the lawn stayed healthy. The seed quality is noticeably better than what I’ve bought from big-box stores."
— Ryan C.

FAQs

Please read our FAQs page to find out more.

What makes your products better?

All of our products, including our seeds and fertilizers, were developed for professional uses. This means that you are truly getting the best of the best when it comes to lawn care products. Forget the big box store products and try what the pros use.

Do you provide guides on how to use your products?

Yes, of course we do. Take a look at our Guides page. We will be adding more guides and helpful tools soon as well.

Can you help me decide what I need?

Yes! We are here to help. Contact us anytime with your questions and we will get back to you within 1-2 days with some suggestions. We also have our Guides page which can answer some questions, and we have more helpful tools coming soon.

How can I get your products?

We ship Canada wide by UPS and Canada Post (it depends on the location). Every shipment is expedited to arrive as soon as possible, and ships within 1-2 days. We also have a pickup location in Burlington, Ontario.